Abstract: Improved biofilters for treating wastewater are disclosed. Specifically, certain aspects of the inventive biofilter comprise a water-tight, leak proof container housing a plurality of sacks stacked upon one another. Alternatively, the water-tight container may contain course sand for use as a re-circulating sand filtration unit. In the first embodiment, each sack contains a composition of filtering material through which the wastewater influent flows prior to removal from the biofilter via a pump tank. Other aspects of the present invention include a biofilter having a plurality of apertures disposed through the floor and through which the wastewater effluent may flow to the underlying ground. The invention is also directed to novel compositions of filtering material for use in the inventive biofilters as well as conventional biofilters. Preferred compositions comprise peat, coconut fibers, large or open cell film block pieces, and course sand.

Abstract: Improved biofilters for treating wastewater are disclosed. Specifically, certain aspects of the inventive biofilter comprise a water-tight, leak proof container housing a plurality of sacks stacked upon one another. Alternatively, the water-tight container may contain course sand for use as a re-circulating sand filtration unit. In the first embodiment, each sack contains a composition of filtering material through which the wastewater influent flows prior to removal from the biofilter via a pump tank. Other aspects of the present invention include a biofilter having a plurality of apertures disposed through the floor and through which the wastewater effluent may flow to the underlying ground. The invention is also directed to novel compositions of filtering material for use in the inventive biofilters as well as conventional biofilters. Preferred compositions comprise peat, coconut fibers, large or open cell film block pieces, and course sand.